a joke-2--how old is she?

      a woman  was having trouble with her heart, so she went to see a doctor. he was a new doctor,and did not know her.he first asked her some questions, one of which was:"how old  are you?"

     "well, i don't remember , doctor, but i'll try to think ."the woman thought for a minute and then said :"yes, i remember now, doctor.when i married, i was 18 yeas old ,and my husband was 30.my hand is 60 now , and that's twice 30.so i'm twice 18.that's 36,isn't it?"